Loïc Saint-martin

University of Illinois Chicago | UIC · Department of Bioengineering

Transcranial ultrasound imaging is a popular method to study cerebral functionality and diagnose brain injuries. However, the detected ultrasound signal is greatly distorted due to the aberration caused by the skull bone. The aberration mechanism mainly depends on thickness and porosity, two important skull physical characteristics. Although skull...

During head examinations, real-time information relevant to potential cerebral injuries can be obtained using a simple, non-invasive, and portable ultrasound scanning protocol. However, for adult human applications, the clinical diagnostic process based on transcranial ultrasound imaging remains inconclusive. This is due to acoustic aberrations, i....

One of the primary challenges in ring single‐element photoacoustic tomography systems is the low image quality in areas away from the center of the ring. This is mainly due to the limited field of view (FOV) of each transducer, which in turn reduces the imaging FOV. To address this shortcoming, we have put forward a practical and straightforward so...

During medical investigations of the head, ultrasound measurements can offer information with simple, non-invasive, and real-time procedure. However, for human adult applications, the clinical treatment of transcranial acoustic imaging remains a challenge by the presence of the skull, results in acoustic aberrations caused by two main phenomena, i....

Structures made of a metallic film deposited on a substrate are conventionally used as opto-acoustic transducers for picosecond ultrasonic experiments where detection in the time domain of the Brillouin scattering in a transparent sample is sought. In this paper, we substitute the metallic film for a periodic stack of nanometric layers made of gold...

Acoustic biosensors are widely used in physical, chemical, and biosensing applications. One of the major concerns in acoustic biosensing is the delicacy of the medium through which acoustic waves propagate and reach acoustic sensors. Even a small airgap diminishes acoustic signal strengths due to high acoustic impedance mismatch. Therefore, the pre...

In transcranial brain imaging, the presence of the skull represents a challenge in the generation of clear signals and in its understanding. For human adult skull, and animals with thick skull, optical and ultrasound propagations are significantly degraded due to the bone properties. This study aims to understand and quantify the optical, ultraso...